Analysis and verification of a pyroshock test system

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2021-2-03

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Küçükbayram, Anıl İsmail

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In the aerospace industry, systems, subsystems, and units are exposed toexplosive events during their lifecycle. Any explosive event creates shock in the structure, and it propagates until it is damped. This shock wave may be hazardous for some electronic and optical components. It may damage a component and cause failure in the equipment. For this reason, satellite equipmenthas tobe qualifiedto withstand all static and dynamic loads encountered during launch and operational life. Thus, one of the challenging tests in the qualification process is the pyroshock test, which is performed on aerospace structures to ensure equipment functionality and integrity against shock load. There are several methods to perform a pyroshock test. The commonly used method is by mechanical impact. A resonant plate is excited by a hammer, and shock waves propagate through the plate. This type of test system is suitable for testing space equipment that will be exposed to mid-field and far-field shock. Test system configuration parameters such as plate thickness, mass, geometry, etc., are adjusted to obtain an appropriate Shock Response Spectrum (SRS)profile. Some of these parameters are less effective, and some are highlyeffective in obtaining the desired shock profile. The test operator has to performlong trials with the dummy model to obtain the targettest profile. In order to minimize this preparation time, the effects of the configuration parameters must be well known. Therefore, this study was started by analyzing the effect of configuration parameters on the SRS profilein ABAQUS/Explicit finite element software. The requested SRS profile for testing is predicted by optimizing configuration parameters in the analysis. In this manner, it is aimed to complete the profile fittingprocess performed on the dummy model in a much shorter time. In this study, measurement,and characterization of pyroshock test system, requirements for various experimental simulations, resonant plate excitation and measurement techniques, data acquisition, and an overview of numerical simulation are reviewed. The developed components of the shock test system and the corresponding finite element model are experimentally validated. The shock tests are simulated using ABAQUS/Explicit finite element software. As a result of this research, an accuratefinite element modeling technique for future shock test simulation and prediction of test results was developed.

Subject Keywords

Pyroshock simulation, Shock response spectrum, Impact force profile, Shock testing, Space equipment

URI

https://hdl.handle.net/11511/89644

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

A. İ. Küçükbayram, “Analysis and verification of a pyroshock test system,” M.S. - Master of Science, Middle East Technical University, 2021.